Detailed Instructions: You are given a sentence and your task is to generate another sentence that supports the given input.
Q: Amniote Lagerst&auml;tten E xquisite preservation became the rule for many new amniote discoveries (birds, reptiles, mammals or any other group of vertebrates that undergoes embryonic development within a thin membrane forming a closed sac, or amnion).
A:
Because their embryos are surrounded by a thin membrane, reptiles are considered amniotes.